LVM Link and Node Failure Recovery Time (June 2009)

ManualsBrandsHP ManualsSoftwareHP-UX 11i Volume Management (LVM/VxVM) Software

LVM Link and Node Failure Recovery Time

Abstract.............................................................................................................................................. 2

Formulas............................................................................................................................................. 2

SLVM Recovery Time Formula ............................................................................................................ 2

HP-UX 11i v3 March 2008 release and prior HP-UX 11i releases ...................................................... 3

HP-UX 11i v3 September 2009 release and later releases................................................................. 3

LVM Link Failure Recovery Time Formula ............................................................................................. 4

HP-UX 11i v3 and prior releases .................................................................................................... 4

For More Information ........................................................................................................................... 5

Call to action ...................................................................................................................................... 5

Summary of content (5 pages)

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LVM Link and Node Failure Recovery Time Abstract.............................................................................................................................................. 2 Formulas............................................................................................................................................. 2 SLVM Recovery Time Formula ............................................................................................................
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Abstract The HP-UX Shared Logical Volume Manager (SLVM) is a cluster volume manager that can support Oracle Real Application Cluster (RAC) applications in HP-UX Serviceguard clusters. The Using Serviceguard Extension for RAC manual located on docs.hp.com refers to the SLVM Recovery Time formulas provided in this document. In Using Serviceguard Extension for RAC, the SLVM Recovery Time is called the SLVM timeout.
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The number of shared volume groups in the cluster with at least one mirrored logical volume with consistency recovery set to MWC or NOMWC.
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LVM Link Failure Recovery Time Formula The PV links for a PV are all of the lun path device special files (DSFs) configured in LVM for that PV. At any point in time, one PV link is the active link for the PV. All I/Os are sent to the lun through the active link lun path. The other PV links are listed as alternate links in the vgdisplay –v command, and serve as standby links. When an active link fails, LVM selects one of the accessible alternate links as the new active link.
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For More Information To learn more about LVM and HP-UX system administration, refer to the following documents on the HP documentation website (http://docs.hp.com): • HP-UX System Administrator’s Guide: Logical Volume Management http://docs.hp.com/en/5992-4589/5992-4589.pdf • The following LVM White Papers are available at the HP documentation website: http://www.docs.hp.